Russula albonigra 

Russula albonigra3399

Russula albonigra (Krom.) Fries

White russula that blackens quickly with no red intermediate stage. Crowded, narrow gills maturing black. 

It is in the Russulaceae family of the Russulales.

Russula albonigra3447

Russula albonigra 

Russula albonigra3469

Russula albonigra 

Russula albonigra7208

Russula albonigra 

Russula albonigra1020066

Russula albonigra